Creep buckling of columns Page: 3 of 25
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2 NACA TN 3138
as a function of a parameter which includes the effect of end load and
initial curvature. The results of the calculations are presented in
tables and charts which enable the designer to determine the critical
time once the parameters appearing in the basic uniaxial tensile or com-
pressive creep law are determined experimentally at design temperature.
The authors are indebted to Professor N. J. Hoff for his guidance
and criticism, to Professor F. V. Pohle for his assistance on the mathe-
matics contained herein, to Mr. R. Ortasse for his assistance with the
calculations, and to the National Advisory Committee for Aeronautics for
sponsorship of the research reported in this paper.
A area of idealized H-section
El effective elastic modulus
fc amplitude of time-dependent deflection (accrued for
t >0) divided by h
fi amplitude of initial deviation from straightness of
unloaded column divided by h
fTo amplitude at t = 0 of total deviation from x-axis of
loaded column divided by h (x-axis is drawn between
end points of column), f/[l - (-/a.E
h distance between flanges of idealized H-section
I moment of inertia of idealized H-section, Ah2/4
L column length
m exponent in viscosity term
S = - Cl)n cosm-2(n/m)
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Kempner, Joseph & Patel, Sharad A. Creep buckling of columns, report, January 1954; (https://digital.library.unt.edu/ark:/67531/metadc57180/m1/3/: accessed April 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.